UBUNTU-CVE-2026-6276

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Source

https://ubuntu.com/security/CVE-2026-6276

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6276.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-6276

Upstream

CVE-2026-6276

Downstream

USN-8227-1

Related

USN-8227-1

Published

2026-04-29T14:00:00Z

Modified

2026-05-20T22:03:09Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Ubuntu - low

Summary

[none]

Details

Using libcurl, when a custom Host: header is first set for an HTTP request and a second request is subsequently done using the same easy handle but without the custom Host: header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.

References

Affected packages

Ubuntu:22.04:LTS / curl

Package

Name: curl
Purl: pkg:deb/ubuntu/curl?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

7.81.0-1ubuntu1.24

Affected versions

7.*

7.74.0-1.3ubuntu2

7.74.0-1.3ubuntu3

7.80.0-3

7.81.0-1

7.81.0-1ubuntu1.1

7.81.0-1ubuntu1.2

7.81.0-1ubuntu1.3

7.81.0-1ubuntu1.4

7.81.0-1ubuntu1.6

7.81.0-1ubuntu1.7

7.81.0-1ubuntu1.8

7.81.0-1ubuntu1.10

7.81.0-1ubuntu1.11

7.81.0-1ubuntu1.13

7.81.0-1ubuntu1.14

7.81.0-1ubuntu1.15

7.81.0-1ubuntu1.16

7.81.0-1ubuntu1.17

7.81.0-1ubuntu1.18

7.81.0-1ubuntu1.19

7.81.0-1ubuntu1.20

7.81.0-1ubuntu1.21

7.81.0-1ubuntu1.22

7.81.0-1ubuntu1.23

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "7.81.0-1ubuntu1.24"
        },
        {
            "binary_name": "libcurl3-gnutls",
            "binary_version": "7.81.0-1ubuntu1.24"
        },
        {
            "binary_name": "libcurl3-nss",
            "binary_version": "7.81.0-1ubuntu1.24"
        },
        {
            "binary_name": "libcurl4",
            "binary_version": "7.81.0-1ubuntu1.24"
        }
    ],
    "priority_reason": "Upstream defined this as low severity."
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6276.json"

Ubuntu:24.04:LTS / curl

Package

Name: curl
Purl: pkg:deb/ubuntu/curl?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

8.5.0-2ubuntu10.9

Affected versions

8.*

8.2.1-1ubuntu3

8.2.1-1ubuntu3.1

8.4.0-2ubuntu1

8.5.0-2ubuntu1

8.5.0-2ubuntu2

8.5.0-2ubuntu8

8.5.0-2ubuntu9

8.5.0-2ubuntu10

8.5.0-2ubuntu10.1

8.5.0-2ubuntu10.2

8.5.0-2ubuntu10.3

8.5.0-2ubuntu10.4

8.5.0-2ubuntu10.5

8.5.0-2ubuntu10.6

8.5.0-2ubuntu10.7

8.5.0-2ubuntu10.8

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "8.5.0-2ubuntu10.9"
        },
        {
            "binary_name": "libcurl3t64-gnutls",
            "binary_version": "8.5.0-2ubuntu10.9"
        },
        {
            "binary_name": "libcurl4t64",
            "binary_version": "8.5.0-2ubuntu10.9"
        }
    ],
    "priority_reason": "Upstream defined this as low severity."
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6276.json"

Ubuntu:25.10 / curl

Package

Name: curl
Purl: pkg:deb/ubuntu/curl?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

8.14.1-2ubuntu1.3

Affected versions

8.*

8.12.1-3ubuntu1

8.13.0-5ubuntu1

8.14.1-1ubuntu2

8.14.1-1ubuntu3

8.14.1-2ubuntu1

8.14.1-2ubuntu1.1

8.14.1-2ubuntu1.2

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "8.14.1-2ubuntu1.3"
        },
        {
            "binary_name": "libcurl3t64-gnutls",
            "binary_version": "8.14.1-2ubuntu1.3"
        },
        {
            "binary_name": "libcurl4t64",
            "binary_version": "8.14.1-2ubuntu1.3"
        }
    ],
    "priority_reason": "Upstream defined this as low severity."
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6276.json"

Ubuntu:26.04:LTS / curl

Package

Name: curl
Purl: pkg:deb/ubuntu/curl?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

8.18.0-1ubuntu2.1

Affected versions

8.*

8.14.1-2ubuntu1

8.17.0-1ubuntu1

8.18.0-1ubuntu1

8.18.0-1ubuntu2

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "8.18.0-1ubuntu2.1"
        },
        {
            "binary_name": "libcurl3t64-gnutls",
            "binary_version": "8.18.0-1ubuntu2.1"
        },
        {
            "binary_name": "libcurl4t64",
            "binary_version": "8.18.0-1ubuntu2.1"
        }
    ],
    "priority_reason": "Upstream defined this as low severity."
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6276.json"